It’s been more than two years since France’s Chaos Echoes released their debut full length album, “Transient,” which showcased the band’s deft navigation among labyrinthine channels under, around, and through the outer reaches of the extreme metal genre. “The Unfathomable” MLP may be regarded as an Interzone between the aforementioned “Transient” album and Chaos Echoes’ forthcoming full length, entitled “Mouvement,” which will also be released on NWN! Productions. While this EP is intended as a bridge between the band’s first and second albums, it is also an outlier of sorts, in that this recording is more shapeless and ambient than the album material. “The Unfathomable” is one track—the longest piece in the Chaos Echoes catalog—covering a full side of an LP. (The other side features an etching designed by band leader and visual artist, Stefan Thanneur, who created all the artwork for the release.) “The Unfathomable” is among the most evocative and atmospheric pieces Chaos Echoes has performed.